body {
    font-family: "Lato", sans-serif;

}

.sid {
    height: 100%;
    width: 160px;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #ebf0f3;
    overflow-x: hidden;
    padding-top: 20px;
}

.sid a {
    padding: 6px 8px 6px 16px;
    text-decoration: none;
    font-size: 25px;
    color: #818181;
    display: block;
}

.sid a:hover {
    color: #f1f1f1;
}

.mm {
    margin-left: 160px; /* 与sidenav的宽度相同 */
    font-size: 28px; /* 字体放大，让页面可滚动 */
    padding: 0px 10px;
}

@media screen and (max-height: 450px) {
    .sid {padding-top: 15px;}
    .sid a {font-size: 18px;}
}